Perovskite LaCoO₃ is of great potential in electromagnetic wave absorption considering its outstanding dielectric loss as well as the existing magnetic response with the magnetic doping. However, the dissipation mechanism of the magnetic doping on the microwave absorption is lack of sufficient investigated. In this paper, LaCo_1-xFe_xO₃ (x=0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, LCFOs) perovskites with different Fe doping amounts were prepared successfully by the sol-gel method and subsequent heat treatment in the air atmosphere. The structure characterization carried out by the first-principles calculations shows the effect of Fe doping on the dielectric and magnetic properties of LCFOs and the strong hybridization of Co/Fe-3d with O-2p in the LCFOs system was successfully demonstrated. Particularly, when x=0.1 and the thickness is only 1.95 mm, the LaCo_0.9Fe_0.1O₃ exhibits the best microwave absorption performance with the minimum reflection loss (RL) value of about -41 dB. The typical samples achieve a broad effective absorption bandwidth (EAB) of 5.16 GHz (7.92-13.08 GHz), which covers the total X band (8-12 GHz). Considering that, the especial Fe doping perovskite is promising to be a candidate as efficient microwave absorbers.

钙钛矿LaCoO ₃考虑到其出色的介电损耗以及现有的磁性掺杂磁响应，在电磁波吸收方面具有巨大潜力。然而，磁掺杂对微波吸收的耗散机制缺乏充分研究。在本文中，LaCo _{1- x} Fe _x O ₃ ( x=0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, LCFOs)不同Fe掺杂量的钙钛矿通过溶胶-凝胶法和随后在空气气氛中热处理成功制备。通过第一性原理计算进行的结构表征显示了 Fe 掺杂对 LCFOs 介电和磁性能的影响，并且成功证明了 Co/Fe-3d 与 O-2p 在 LCFOs 系统中的强杂化。特别是当x =0.1 且厚度仅为 1.95 mm 时，LaCo _0.9 Fe _0.1 O ₃表现出最佳的微波吸收性能，最小反射损耗 (RL) 值约为 -41 dB。典型样品实现了 5.16 GHz (7.92-13.08 GHz) 的宽有效吸收带宽 (EAB)，覆盖了整个 X 频段 (8-12 GHz)。考虑到这一点，特殊的 Fe 掺杂钙钛矿有望成为有效的微波吸收剂的候选者。